MacBook 802.11n Question

I've tried some digging here, Google, and Wikipedia and haven't found much. Is anyone aware if the latest iteration of the MacBooks that came with 802.11n support (IE: didn't have to buy the "accounting" upgrade) - does it actually have multiple antenna's for MIMO?

I've noticed that downloads and connectivity have been much faster with just my G-router. I'm assuming that it would be because there are multiple antennas in the laptop giving it some diversity on the G router.

Now, the notebooks had multiple antennas since long before MIMO... so I can't guarantee that the antennas were always configured for MIMO. But I'm fairly certain that even iBooks, and certainly MBs and MBPs have more than one antenna. Most Windows notebooks have had more than one antenna for years as well.

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